The network of neurons that extends through the core of the brainstem and selects information that reaches the cerebral cortex during sleep is the
A) medulla.
B) limbic system.
C) reticular formation.
D) brainstem core.
Answer: C
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Which may be or is an RNA molecule?
A. AGCCTAC B. GGGCCCA C. GCCCUUA D. AGCCTAC AND GGGCCCA E. GGGCCCA AND GCCCUUA
In the 1920s, Otto Loewi discovered that
a. a frog heart would beat outside the animal. b. the nerve to a frog’s heart released a chemical that affected only that heart. c. neuron endings release a neurotransmitter when stimulated. d. a saline solution caused an isolated frog heart deprived of its own nerve supply to beat more slowly. e. ACh acts on skeletal muscle, smooth muscle, the heart, some glands, and the brain.
In plants, what are embolisms?
A) toxic acids produced when stomata are closed and it's sunny
B) formations of ice crystals when a plant is subjected to below-freezing temperatures
C) hormones that result in apical dominance
D) air bubbles that form within xylem
In muscles, aerobic respiration uses glucose derived from stored glycogen as energy source for the first ten minutes of activity; after over half an hour, _____________ becomes the main fuel source.
A. lactate B. fatty acid C. myoglobin D. protein E. blood glucose